Interstage matching network attenuator

Abstract

An impedance matching network for a radio frequency (RF) transmission system can include first port for coupling to a first transistor differential pair. The network can further include a second port for coupling to a second transistor differential pair. The network can further include a matching network connected to the first port and the second port, the matching network comprised of a pair of coupled lines. Other aspects are described.

What is claimed is: 
     
         1 . An impedance matching network for a radio frequency (RF) transmission system, the impedance matching network comprising:
 a first port, the first port coupled to a ground terminal via a first circuit portion, the first circuit portion comprising a first capacitance and a first inductance coupled in parallel;   a second port the second port coupled to the around terminal via a second circuit portion, the second circuit portion comprising a second capacitance and a second inductance coupled in series;   a matching network connected to the first port and the second port, the matching network comprising a pair of coupled lines; and   at least one auxiliary line coupled to the pair of coupled lines, the at least one auxiliary line comprising a switchable resistive array.   
     
     
         2 . The impedance matching network of  claim 1 , further comprising two series inductive elements. 
     
     
         3 . The impedance matching network of  claim 2 , wherein the two series inductive elements are connected at the first port. 
     
     
         4 . The impedance matching network of  claim 3 , further comprising a capacitive element at the first port. 
     
     
         5 . The impedance matching network of  claim 2 , wherein the two series inductive elements are coupled at one of the first port and the second port, based on an impedance transformation ratio of the impedance matching network. 
     
     
         6 . The impedance matching network of  claim 1 , wherein the coupled lines have a length based on a frequency of operation of the RF transmission system. 
     
     
         7 . A wireless communication device comprising:
 at least two antennas; and   transmitter circuitry coupled to the at least two antennas, the transmitter circuitry comprising:
 a first port, the first port coupled to a ground terminal via a first circuit portion, the first circuit portion comprising a first capacitance and a first inductance coupled in parallel; 
 a second port the second port coupled to the around terminal via a second circuit portion, the second circuit portion comprising a second capacitance and a second inductance coupled in series; 
 a matching network connected to the first port and the second port, the matching network comprising a pair of coupled lines; and 
 at least one auxiliary line coupled to the pair of coupled lines, the at least one auxiliary line comprising a switchable resistive array. 
   
     
     
         8 . The wireless communication device of  claim 7 , wherein the matching network further comprises two series inductive elements. 
     
     
         9 . The wireless communication device of  claim 8 , wherein the two series inductive elements are connected at the first port. 
     
     
         10 . The wireless communication device of  claim 8 , wherein the two series inductive elements are coupled at one of the first port and the second port based on an impedance transformation ratio of the matching network. 
     
     
         11 . The wireless communication device of  claim 8 , wherein the matching network further comprises an attenuation circuit comprising the auxiliary lines coupled to the pair of coupled lines. 
     
     
         12 . The wireless communication device of  claim 11 , wherein at least one of the auxiliary lines is coupled to at least another switchable resistive array. 
     
     
         13 . The wireless communication device of  claim 11 , further comprising two series inductive elements coupled at the first port of the attenuation circuit. 
     
     
         14 . The wireless communication device of  claim 11 , further comprising a capacitive element and two series inductive elements coupled at the second port of the attenuation circuit. 
     
     
         15 . A method for communicating in a mmWave network, the method comprising:
 providing a first port, the first port coupled to a ground terminal via a first circuit portion, the first circuit portion comprising a first capacitance and a first inductance coupled in parallel;   providing a second port, the second port coupled to the ground terminal via a second circuit portion, the second circuit portion comprising a second capacitance and a second inductance coupled in series;   providing a matching network connected to the first port and the second port, the matching network comprising a pair of coupled lines; and   providing at least one auxiliary line coupled to the pair of coupled lines, the at least one auxiliary line comprising a switchable resistive array.   
     
     
         16 . The method of  claim 15 , further comprising:
 providing two series inductive elements connected at one of the first port and the second port, based on an impedance transformation ratio of an impedance matching network comprising the first port, the second port, and the matching network.   
     
     
         17 . The method of  claim 15 , further comprising:
 determining a length of the coupled lines based on a frequency of operation in the mmWave network.